Licensing, SD cards

The RexCore @RPi is licenced with the used hardware. We plan to use UniPi v1.1 + EMO_AO4/12. Also the new PiDrive for SSD-Drive shall be used. The PiDrive comes later (also the 4/12 AO-ext. due to missing Rex-drv.) so there is the question if licencing without SSD and AO-ext. at the beginning requires a new key in the end (with SSD + AO)?
We read that SDCard is also used for hardware-ID/license key. If users only work with SDCard and it corrupts they would need a new key, isn't it?

For our purpose we need system as stable as possible - that's why we choosed PiDrive or USB-Mini-HDD for Linux. A backup-system (another RPi with another SDCard) would be impossible with only 1 license-key, wouldn't it?

The RexCore @RPi is licenced with the used hardware. We plan to use UniPi v1.1 + EMO_AO4/12. Also the new PiDrive for SSD-Drive shall be used. The PiDrive comes later (also the 4/12 AO-ext. due to missing Rex-drv.) so there is the question if licencing without SSD and AO-ext. at the beginning requires a new key in the end (with SSD + AO)?
We read that SDCard is also used for hardware-ID/license key. If users only work with SDCard and it corrupts they would need a new key, isn't it?

For our purpose we need system as stable as possible - that's why we choosed PiDrive or USB-Mini-HDD for Linux. A backup-system (another RPi with another SDCard) would be impossible with only 1 license-key, wouldn't it?

Adding SSD storage or USB flash drive will not affect your licence. Neither will the attached hardware or extension modules. It is only the Raspberry Pi and the SD card which is taken into account.

The licence is always bound to both the Raspberry Pi and the SD card, this cannot be changed. If the SD card dies, we can generate a new key for you, but note that it is an emergency solution and cannot be repeated very often.

If your SD cards die often, it must have a reason and you should find it and avoid it (low-quality SD cards, powering off without proper shutdown, too frequent writing to disk, etc.).

There is no problem running REX from a read-only filesystem, which I recommend when reliability is the most crucial.

Another option is to go for the Raspberry Pi compute module, which uses integrated eMMC Flash for storage. But I do not know your product and quantities you are considering.

Hello Jaroslav,
maybe it's a good idea to use a small “industrie SDcard“ which should not be too expensive for using only the bootloader. This card combined with the RPi should be the unchangeable system for the Rex-ID.
With Linux on SSD/PiDrive or USB-HDD there is option for writing. Almost the Linux-logs do that and configuring Linux to avoid this costs lot of time (for newbies).
We would start with 2h demo and will license when PiDrive arrives.
With best regards
iot